Fix bitly monthly calcs
Fix bitly monthly calcs

The raw files contain multiple days so the stats were way out ;)
Now calculate them from the daily csv files.

Signed-off-by: Simon Bennetts <86dd6fc569bc24d96c23727e2734cc63308a81de@gmail.com>
zapbot/zap-mgmt-scripts,zapbot/zap-mgmt-scripts,zapbot/zap-mgmt-scripts